What action should be taken when Signal 12 is received?

When Signal 12 is received, it indicates the need to call the District Headquarters (DHQ) by phone. This protocol is crucial for ensuring effective communication and coordination among law enforcement personnel. This might involve discussing critical situations or information that require immediate verbal clarification or instructions. The action underscores the importance of direct communication in urgent scenarios rather than relying solely on digital or radio communication methods, which may have limitations or delays.

Understanding the context of the other options can clarify why they are not the actions indicated by Signal 12. Technical problems with the computer or a drug courier alert are associated with specific incidents or operational alerts, but they do not encompass the requisite action of reaching out directly to the DHQ. Similarly, having traffic relay may pertain to traffic-related incidents but would not be appropriate in the context of a Signal 12, which specifically instructs officers to make that phone call.